Chemical Reactions
📋 What it is
In a reaction, substances rearrange into NEW substances — signalled by colour, gas, heat, or a new solid.
🗣️ Coach says
A chemical reaction is a real transformation: atoms rearrange to make new stuff with new properties. Watch for the tell-tale signs — a colour change, bubbles (a gas), heat, or a new solid forming. Rust and burning are reactions you see all the time.
🧠 Memory hook
Reaction = atoms rearrange into NEW substances. Look for colour, gas, heat, new solid.
😂 Giggle
Why are scientists never lonely at the Grand Laboratory?
Because they always have great chemistry with their team!
😲 Whoa!
The fizz from baking soda and vinegar is a real reaction producing a brand-new gas — the bubbles are the new substance escaping.
✅ Quick check: Bubbles appear when you mix two substances. Sign of a reaction?
Say your answer out loud first — then reveal.
Yes — a new gas forming (not just boiling) is a classic sign a chemical reaction occurred.
Gas production signals a new substance was made.
🧪 Try it! (2 minutes)
Mix a spoon of baking soda with vinegar. The fizz is CO₂ — a new substance being made.